What if you don’t have something to lock your bike to? Enter LINKA, it’s a self locking bike lock that doesn’t need a structure. It basically locks your wheel to make your bike immobile, with only the touch of a button. You can control the lock using your smartphone or use a 4-digit pin on the lock. And if a thief is desperate enough to try to carry your bike, there is a loud 100 decibel alarm that activates when it senses the bike is being moved. The LINKA can be used with your existing U lock or chain, but that really defeats the purpose of this super convenient lock.